The first cycle computer I got was an enormously complicated thing measuring instantaneous, average and cumulative speeds, distances and cadences with and without breaks by means of several lightyears of wire. It was also white. I set it in miles because I lived in Britain and it was the 1980s. I then spent a couple of years away from my bike and mostly in countries where they use kilometres (though also briefly in countries where in practice they didn't use either km or miles). I then got another bike and shortly afterwards another cyclocomp in Poland, so naturally I set it to km. I've kept this habit up, perhaps due to audaxy influences or perhaps due to years of accustomization to post-Napoleonic measures, until a couple of weeks ago when I took the computer off the bike. I might get around to sticking it on FTAGH unless I decide it's worth something (or even that I want to use it again). The GPS is still in km but only if I look at the data summary page, I don't have that displayed normally.